For both colloidal and Newtonian fluids, we observed the rupture velocity of constant-volume films decreases with increasing fluid (effective) viscosity. Our characterization of the film thickness profile via interference imaging and dye absorption shows that higher viscosity films lead to higher thickness near the film center, as viscosity modifies the overall thickness profile. This increase is consistent with the predictions of LLD theory in the visco-capillary regime [1]}, [2]}.
